class EacRubyUtils::Envs::Command

def append(args)
  duplicate_by_command(@command + args)
end

def append_command_options(command, options)
  command = options[:input].command + ' | ' + command if options[:input]
  if options[:input_file]
    command = "cat #{Shellwords.escape(options[:input_file])}" \
      " | #{command}"
  end
  command += ' > ' + Shellwords.escape(options[:output_file]) if options[:output_file]
  command
end

def args
  @command
end

def command(options = {})
  c = @command
  c = c.map { |x| escape(x) }.join(' ') if c.is_a?(Enumerable)
  append_command_options(
    @env.command_line(
      append_chdir(append_concat(append_envvars(c)))
    ),
    options
  )
end

def debug?
  ENV['DEBUG'].to_s.strip != ''
end

def debug_print(message)
  message = message.to_s
  puts message.if_respond(:light_red, message) if debug?
end

def duplicate(command, extra_options)
  self.class.new(@env, command, extra_options)
end

def duplicate_by_command(new_command)
  duplicate(new_command, @extra_options)
end

def duplicate_by_extra_options(set_extra_options)
  duplicate(@command, @extra_options.merge(set_extra_options))
end

def escape(arg)
  arg = arg.to_s
  m = /^\@ESC_(.+)$/.match(arg)
  m ? m[1] : Shellwords.escape(arg)
end

def execute(options = {})
  c = command(options)
  debug_print("BEFORE: #{c}")
  t1 = Time.now
  r = ::EacRubyUtils::Envs::Process.new(c).to_h
  i = Time.now - t1
  debug_print("AFTER [#{i}]: #{c}")
  r
end

def execute!(options = {})
  options[:exit_outputs] = status_results.merge(options[:exit_outputs].presence || {})
  er = ExecuteResult.new(execute(options), options)
  return er.result if er.success?
  raise ::EacRubyUtils::Envs::Command::ExecError,
        "execute! command failed: #{self}\n#{er.r.pretty_inspect}"
end

def initialize(env, command, extra_options = {})
  @env = env
  @extra_options = extra_options.with_indifferent_access
  if command.count == 1 && command.first.is_a?(Array)
    @command = command.first
  elsif command.is_a?(Array)
    @command = command
  else
    raise "Invalid argument command: #{command}|#{command.class}"
  end
end

def prepend(args)
  duplicate_by_command(args + @command)
end

def spawn(options = {})
  c = command(options)
  debug_print("SPAWN: #{c}")
  ::EacRubyUtils::Envs::Spawn.new(c)
end

def system(options = {})
  c = command(options)
  debug_print(c)
  Kernel.system(c)
end

def system!(options = {})
  return if system(options)
  raise ::EacRubyUtils::Envs::Command::ExecError, "system! command failed: #{self}"
end

def to_s
  "#{@command} [ENV: #{@env}]"
end